I remember the manwha where the mc was the strongest in the world despite picking the easiest difficulty tutorial and being stronger than even the players who pick the hardest difficulty. The world the faces annihilation then he regresses back to where he was picking the difficulty of the tutorial and chooses the most difficult. What's the name of that.

I remember a manhwa where the main character was the strongest in the world, despite picking the easiest difficulty tutorial, and was stronger than even the players who picked the hardest difficulty. Then the world faces annihilation and he regresses back to when he was picking the difficulty of the tutorial and chooses the hardest difficulty. 

What's the name of that manhwa?